Free payroll tools for small businesses and freelancers in the US and UK.
OtterDesk provides free, accurate payroll calculators and tax tools — no signup, no ads, no data collection. Everything runs in your browser. Your numbers never leave your device.
OtterDesk is a client-side application. All calculations happen locally in your browser using the latest published tax tables (2025 for the US, 2025/26 for the UK). We don’t run a server, store your data, or use cookies. When you close the tab, your inputs are gone.
OtterDesk provides estimates only. Tax situations vary based on individual circumstances, employer configurations, and jurisdictional rules. Always consult a qualified tax professional or accountant before making financial decisions. We are not affiliated with the IRS, HMRC, or any government agency.
Found a bug? Have a feature request? Need help understanding a calculation? We’d love to hear from you.